Printing machine



March 7, 1950 PRINTING MACHINE 9 Sheets-Sheet 1 Filed March 8, 1943 awn a N T w r n um w r mfiw N wwm /fi J I x x. smwi mu? Q? ,Wmw M N m m a N m Z Rmm March 7, 1950 w. T. GOLLWITZER PRINTING MACHINE 9 Sheets-Sheet 2 Filed March 8, 1943 152% for; 116/ far I d'o/lwz'izer Jftdrrzeys March 7, 1950 w. T. GOLLWITZER PRINTING MACHINE .9 Sheets-Sheet 3 Filed March 8, 1943 March 7, 1950 w. T. GOLLWITZER PRINTING MACHINE '9 Sheets-Sheet 4 Filed March 8, 1943 KUTVRQQW v In z/e nzor Milk? 7:" dolly/fizz?" 2am M M Jt/orrzaya March 7, 1950 w. T. GOLLWITZEQR 2,

PRINTING MACHINE Filed March 8, 1943 9 Sheets-Sheet 6 Zia/fer TdoZZzn'zze r March 7, 1950 w. T. GOLLWITZER 2,500,069

PRINTING MACHINE Filed March 8, 1945 9 Sheets-Sheet 7 ufftornqys March 7, 1950 w. T. GOLLWITZER 2,500,069

PRINTING MACHINE Filed March 8, 1943 9 Sheets-Sheet 9 SET-UP 54/? RETURN SFT- UP BARS SET-UP 8,406 LOCKED SET- UP BAR RET'l/EW 707,44 CVCZA' SE7" UP BARS START RETURN Patented Mar. 7, 1950 UNITED STATES PATENT OFFICE PRINTING MACHINE Application March 8, 1943, Serial No. 478,377

7 Claims. 1

This invention relates to accumulating mechanism and particularly to accumulating mechanism adapted for the entry of numerical items in either an additive or a subtractive sense.

In prior accumulators adapted for either addition or subtraction it has been customary to provide different entry effecting means for the two types of operations. In some instances this has involved the use of a single set of accumulator wheels adapted for selective association with one or the other of two sets. In such prior accumulators it has also been necessary to provide two difierent sets of carry mechanism, one of which is arranged to operate in the subtracting cycles and the other of which is arranged to operate in the adding cycles of the machine. In other instances this has involved the use of a pair of inter-meshed sets of accumulator pinions adapted for selective association with a single set of entry racks, and in such cases the carry-over mechanism has required but one set of carry-over racks or the like with which one or the other of the two sets of accumulator wheels must be selectively associated to determine the direction of entry of carry-over or tens-transfer amounts. The provision of such duplicate mechanism of course entails added complexity of the machine and added cost thereof, and in view of this it is an important object of this invention to enahis the structure of such accumulator mechanism to bematerially simplified; and an object related to the foregoing is to enable either additive or subtractive entries to be made where but a single set of accumulator pinions and a single set of entry elfec'ting devices such as racks are employed. A further object related to the foregoing is to enable a single carry-over mechanism to introduce carry-overs directly into an accumulator in either a subtractive or an additive direc-- tion.

In the use of an accumulator mechanism the elements of the carry-over devices are ordinarily displaced by spring means as an incident to an entry of a carry-over into an order of the accumulator, and when the actual carry-over movement being effected it is desirable to exert a substantial spring pressure so as to thereby sure that the carry over will be properly entered, and when such a heavy spring pressure is used, it will be evident that the problem of restoring the carry-over mechanism to its normal relationship would ordinarily involve the provision of means to overcome this relatively heavy spring pressure. In View of this objectionable feature or condition, it is a further object of this invention to enable the spring pressure on the carry mechanism to be varied in the cycle of operation of the accumulator mechanism to thereby afford heavy spring pressure in the proper direction when a carry-over is to be entered into the accumulator and to afford a relatively slight spring pressure at all other times.

It is a further object of the present invention to enable the carry-over devices, which as hereinbefore pointed out are operable to effect carryover entries in either direction, to be actuated in either direction by a single spring means, and an object related to the foregoing is to enable the direction of effectiveness of a single spring means upon a carry-over mechanism to be selectively determined as an incident to the determination of the type of cycle through which the machine is to be operated. Further objects" related to the foregoing are to enable a single carry-over mechanism which may be actuated in either direction from a normal position to be controlled by a single set of latch devices which act to restrain the carry-over devices against movement in both directions, and to enable such carry-over mechanism to be readily and easily restored to the normal position from either of the positions to which it may be actuated in the course of a carry-over entry elfecting operation.

Other and further objects are to associate an accumulator with an entry eifecting means and a carry-over means in a novel manner whereby simplicity of structure and accuracy of operation are attained; to enable the different types of cycles of the mechanism, including total and subtotal cycles, to be readily and easily initiated and controlled; and to enable control of the accumulator mechanism in such cycles to be attained in a simple and expeditious manner.

Other and further objects of the present invention will be apparent from the following description and claims and are illustrated in the accompanying drawings which, by way of illustration, show a preferred embodiment and the principle thereof and what I now consider to be the best mode in which I have contemplated applying that principle. Other embodiments of the invention embodying the same or equivalent principle may be used and structural changes may made as desired by those skilled in the art without departing from the present invention and the purview of the appended claims.

In the drawings:

Fig. 1 is a side elevational View of an accumulator mechanism embodying the features of the invention;

Fig. 2 is a fragmental portion of Fig. 1 showing certain parts of the control mechanism in the positions which they occupy in a subtractive cycle;

Fig. 3 is a side elevational view of the other side of the machine of this invention;

Fig. 4 is a fragmental plan view taken substantially along the line 4-4 of Fig. 5;

Fig. 5 is a fragmental vertical sectional view taken substantially along the line 55 in Fig. 4;

Fig. 6 is a perspective view illustrating the form and relationship of the control key levers;

Fig. 7 is a view similar to Fig. 5 and illustrating the parts of the mechanism in the positions which they occupy at the beginning of a total-taking cycle of the machine;

Fig. 8 is a fragmental plan view showing a por tion of the mechanism illustrated in Fig. '7;

Figs. 9 to 13 inclusive are diagrammatic views illustrating the different relationships which the parts of the accumulator mechanism assume in the adding cycles thereof;

Figs. 14 to 16 inclusive are diagrammatic views illustrating the different relationships which the parts of the accumulator mechanism assume in the course of a subtracting operation;

Fig. 17 is a timing chart of the subtracting cycle of the machine of this invention;

Fig. 18 is a timing chart of the adding cycle of the machine;

Fig. 19 is a timing chart of the subtotal cycle of the machine; and

Fig. 20 is a timing chart of the total cycle of the machine.

The accumulator mechanism of the present invention is arranged to accumulate either positive or negative numerical amounts, and is adapted to have printing means associated therewith whereby the numerical items or amounts may be printed upon a suitable record sheet and whereby totals or subtotals may be printed upon such a sheet when desired. The amounts to be entered into the accumulator may of course be set up in many different ways, but in the form illustrated means is adapted to have the numerical amounts set up under control of data bearing cards or records, the numerical amounts represented in such records being sensed and entered into the accumulator.

While the accumulator mechanism as herein illustrated is arranged for manual selection of the type of operative cycle which is to be performed, the arrangement and construction of the unit are such as to be adapted for incorporation of the unit as a part of a larger or multi-unit machine, and in such uses of the present mechanism a greater degree of automatic control would, of course be attained. Thus, as shown in Figs. 1 and 4 of the drawings, the accumulating mechanism is mounted in a frame which includes a pair of spaced side frame members and 3|, and the accumulating mechanism 36 is disposed between the side frames 30 and 3|, and means including a plurality of set-up bars 40 are provided for operating the accumulator mechanism 36. In accordance with this invention the set-up bars 40 serve to enter the desired numerical amounts with the accumulator in either an additive or subtractive direction, and as herein shown the set-up bars Ml extend forwardly or to the left in Figs. 1 and 4 so as to enable these bars to be differentially set as by means of a card sensing mechanism of the general character shown in my Patent No. 2,296,277, patented September 22, 1942, particular reference being made to Figs. 120 to 124 of such patent.

The accumulator. 36 includes a plurality of accumulator wheels 50, Figs. 4, 5 and 7, there being an accumulator wheel 5!] for each set-up bar 60. These accumulator wheels 50, in the present instance, are in the form of gears and are rotatably mounted on shouldered collars, these collars each including a shoulder of sufficient thickness to accommodate an accumulator wheel. The collars are mounted on a shaft 5| about which therefore the accumulator wheels are supported for rotation, the shaft 5| being fast to the outer ends of the arms 53 and 54 which are pivotally mounted on spacing collars carried by a shaft 55 which in turn is carried by side plates and 6| of the accumulator unit 36, Fig. 4. The side plate 6| is directly fastened to the inner face of the side frame 3| and lugs as 64, Fig. 1, provided on the side plate 6 l', are detachably connected to the side plate 3|, this mounting of the side plates 60 and 6| providing a detachable mounting for the accumulator unit 36, the various parts of which are carried by the side plates 30 and 3|.

The arms 53 and 54 are connected together to move as a unit and mounted therebetween substantially midway in the extent thereof is a roller 66 that may ride on the periphery of a cam 61 fast on a shaft 68 journaled in the side plates 60 and 6|. A gear 69, Fig. 4, fast on the cam shaft 68 outwardly of the side plate 6| receives motion from a gear 10 fast on a main cam shaft 1| of the mechanism through idler pinions as '12 so that each time the main cam shaft 1| is set in rotation, in the manner hereinafter described, the gear 69 and, therefore, the accumulator cam shaft 68 are caused to make a complete revolution, the ratio between the gears being such that the accumulator cam shaft 63 rotates synchronically with the main cam shaft 1 In the course of rotation of the cam 61 with the accumulator cam shaft 68, a rise on this cam engages the roller 56 and pivots the arms 53 and 54 in such a manner that the accumulator gear wheels as 50 are respectively engaged with the racks 15 formed on the lower edges of the set-up bars 40, each accumulator gear wheel 50 being respectively aligned with a rack 15. By selective engagement with the racks '15 during particular portions of the longitudinal movements of the set-up bars 40, the desired numerical amounts 0 are entered either additively or subtractively into the accumulator wheels 50, as will hereinafter be described in detail, but for present purposes it should be observed that when an additive entry is to be made, the accumulator wheels 50 are engaged with the racks 15 during the forward or restoring movement of the set-up bars 40, thereby to actuate the accumulator wheels 50 in a counterclockwise direction, Fig. 5; while in a subtracting operation the accumulator wheels 50 engage the racks 15 while the set-up bars 4|! move rearwardly, thereby to actuate the accumulator wheels 50 in a clockwise direction, Fig. 5.

The set-up bars 40 are mounted and guided for sliding movement as by means of a supporting shaft 18 extending between the side frames 30 and 3|, the shaft 18 being extended through longitudinal slots 19 formed in the rear ends of the set-up bars 40. Preferably the shaft 18 has an individual roller 80 mounted thereon for en- 0 gagement with the slot 19 in each set-up bar 40.

The set-up bars 40 are also engaged with a slotted guide bar 8| extended between the side frames 3|) and 3| just forwardly of the shaft 18. Thus the rear ends of the set-up bars 40 are accurately supported and guided, and the forward ends thereof 5 areaccurately .Euideddhia lateraiasense byzsuitable means, as for example, in the manner shown in my aforesaid patent.

The set-up bars 40 arereoiprocatedin each operation of the accumulator 36 and, for the purpose of imparting such reciprocatory movement to these-bars, a roller 95, Figs. 1 and 3, isextended past the inner'or rear ends of the set-up bars 40, and in a manner explained :presently, springs act on the set-up bars tomaintain the ends thereof engaged with the roller 95. This roller is mounted on "a shaft carried by a double armed rocker 96 fastto the shaft 91 journaledin suitable bearingsin'the side plates -301and 3I. A depending arm 98 is clamped to the'shaft 91so as 'to alfor'd an adjustable connection between this arm and the shaft 91. The arm 98 'has a roller 99 mounted at the freeen'd thereof and this roller bears against'the periphery of'a cam I09 fast on the shaft H the roller 99 being urged into engagement with the peripheryof the cam I by the aforesaid springs acting on the setup bars 40.

Rotary movement isim'parted to the main cam shaft "I I through a clutch I05, such as is disclosed in my Patent No. 2,265,133,1patented December 9, 1941. This clutch I comprises a driving member such as 'a "pulley I06 thatis rotatable on the shaft "II, and a driven member that is slidably but no'nr'otatably mounted on the'shaft 'H,'-the driven member'bein'g urged toward engagement with the driving-member I06and being governed by a disengaging cam Int-and a clutch'trip pawl I09, Thec'am IBBis operative, asdescribedlin the aforesaid Patent No. 2,265,133, to c'disen'gage the clutch I05 after the shaft "II has operated through one revolution and when the clutchiis to be again engaged, the-trip pawl I99 is mcmentarily actuated in an upward directionby means such as a solenoid'llfl, Fig. 1. In the courseof each rotation of the main camshaftll, induced by energization of the solenoid III] and which connects thesh'aft H to the pulley I06 to'bring about a complete rotation of the shaft II, the cam I00 acts on the roller '99 and through the arm 98 to rock the shaft 91 and therefore the rocker'96 which in such an'event moves in a clockwise direction, as viewed in'Fig. 1, at the start of an operation. This action serves to withdraw the roller 95 in a'rearwar'd direction so as to permit rearward sensing movement of the set-up bars 40, as will hereinafter be described in detail.

Each set-up bar 4|] has a rack I I2 formed in the upper edge thereof-and such racks mesh with gear segments I I3 that are rotatably mounted on a shaft I I 4'which may serve to associatethe bars 49 with a printing mechanism of the kind shown in the first mentioned of my aforesaid prior patents, andsprings as -II'6 extend between-each gear segment'as I I3 and pins as II-6' extended between the side platestfl and 3|. It is the-action of the springs as I I6 on the gear-segments as II3 through the respective racks as 'II2 which are effective to engage theset-up bars 40 with the roller 95 and this spring pressure is normally effective through the rocker 96, shaft 91 and arm 98 to hold the roller 99 in engagement with the periphery of the cam I09. l-lowever, I prefer also to provide an additional-spring II I acting on the rocker 96 to assure contact of the cam follower 99 with the cam I90 under all conditions.

At the time the rocker 96'starts to move clockwise, as viewed in Fig. 1, the-gear segmentsll'ii are positioned relative to the rack H2 in -the manner shown-in Fig. Land in the courseof the advancing or rearward movement as: the set-up bars- 40 induced .as an incident toisuch clockwise movement of the rocker 96,.the gear segments I I3 move'relative to the raok I I2 intodifferent posi tions. The position which the gear segment H3 will assume in the course of such movement of the set-up'bars 49 is determined by the position attained by these bars in the course of advancing movement thereof, and such position of the set up bars is determined in theadding or subtracting'cycles of the machine by the set-upmechanism with which the bars 40 are'associated.

Where :the accumulator mechanism of this invention is to The set up automatically under the control of recordcards or the "like, such automatic card control may, of course, govern the typeidf cycle of machine operation so as to cause selective addition or subtraction of numerical amounts represented on the record cards, but in the present instance, each cycle of machine operation is initiated manually by-selective actuation of the'appropriate one of a plurality of control keys 'K, Figs. 1, 4, and 6 which govern the type of'ma'chine cycle which is to'be performed.

In the operation of the present mechanism'to introduce numerical amounts into the accumulator in anadditive sense, the accumulatorwheels 5B are maintained in their lower position as shown in Fig. 5 during the rearward sensing or set up operation of the set-up bars 19. Thus in an adding cycle the rocker 96 and theroller carried thereby are first rockedin a clockwise direction, Fig. 1, and during such movement the accumulator Wheels 59 are maintained disengaged-orin other words, in their lower positions as shown'in Fig. 5. Thus the set-up bars 40 are free to the :action of the springs H6 and are moved through distances which are determined by the associated set-up means. By the time the clockwise'movement of'the rocker 99 is completed all of the set-upbars will have attained the positions'in which theyare to stop by reason of the setting of the associated set-up means. Hence the set-up bars 49, at the time when the clockwise movement ol the rocker 96 has been completed, will be positionedto represent a digital count corresponding Withthe numerical amount.

"After the set up bars d9 have thus been set in accordance with the desired values or digits, the cam 61 is 'operative'uponthe rollertii and the frame 'formed by the arms 53 and 54 to elevate the accumulator wheels 50 into engagement with the racks i the set-up bars t9,..and hence in the're'storing movement of the set-up bars 49, as will be hereinafter described, the desired numerical amount will be introduced in an additivesenselinto theaccumulator wheels 59 by rotation thereof'in a counterclockwisedirection as viewed in Fig. 5.

When'thelrocker 93 startsto move counterclockwise, as viewed in Fig. 1, the roller 95 comes into engagement with the ends of the set-up bars 49 that have been arrested in positions representative of significant digits, and after the roller has moved into engagement with the ends cf'these bars the bars thereafter move with the rocker '96 and return to their initial or zero positions. Hence, since the set-up bars have been previously set up to'represent a digital count, and as the accumulator gear wheels 59 are by this time meshed with the racks 15, it fol ows that in the return of the set-up bars dd rotation is imparted to'the gear wheels 59 in an amount proportionate to the digital count to which the respective set-up bars have been set to represent.

Therefore, the digital count represented by the set-up bars 40 will be transferred to the accumulator wheels 50 in an additive sense.

It will be manifest that as various digital values are entered or added into the accumulator wheels as aforesaid, more than ten digits will be entered into a particular wheel 55 and as the tenth digit is entered into a particular wheel it is necessary that a carry-over be made into the order next higher than that to which a particular wheel pertains, and hence an arrangement is provided which will efiect such carry-overs. It has been pointed out hereinbefore that the present invention contemplates entr of numerical amounts into the accumulator in either an additive or a subtractive sense, depending upon the sense in which the numerical amounts are being introduced in the operation in which such carryovers arise. Since the carry-over mechanism of the present invention is operable to introduce carryovers in either an additive or subtractive sense, the cycle of operation of the accumulator in the entry of amounts in a subtractive sense will be discussed in detail prior to the description of the carry-over mechanism.

When a numerical amount is to be introduced into the accumulator in a subtractive sense, the accumulator wheels 50 are elevated into engagement with the racks prior to the initial or rearward movement of the set-up bars 46, and hence as the clockwise movement of the rocker 96 releases the set-up bars 48 for rearward or sensing movement, these set-up bars are operatively connected to the accumulator wheels 56. Hence as a particular set-up bar 40 moves in a rearward direction to a desired set position, this movement which is representative of the value of the desired digit is imparted to the associated accumulator wheel 50 in a clockwise or subtractive direction, and hence the desired digital value is entered subtractively into the related accumulator wheel 50. When the clockwise movement of the rocker 96 has been completed, all of the set-up bars 40 are, in effect, set to represent the numerical values which have been subtractively entered into the accumulator wheels 50. The accumulator wheels are then lowered out of engagement with the rack 75 and to the position shown in Fig. 5, this being accomplished by a cam 23%! which is rendered operative upon the cam roller '66 in a subtracting cycle in a manner which will be hereinafter described in detail. Thus, as the rocker 96 moves through its forward stroke in a counterclockwise direction, the roller 95 thereof will come into engagement with the rear ends of the set-up bars 40 so as to restore the same to their normal positions shown in Fig. 5 of the drawings. Since the accumulator wheels 50 are in their lower positions during such restoring movement of the set-up bars 40, it will be obvious that the accumulator wheels will, during this period, normally remain in the positions to which they have been set during the first half of the cycle of operation.

As hereinbefore pointed out, the accumulator wheels 50 are adapted for selective actuation in either direction, and the present accumulator is therefore provided with carry-over means whereby the requisite carry-overs may be introduced in either direction. To this end the arms 53 and 54 are provided with downwardly extending lugs 24!] between the lower ends of which the mounting shaft 2 is extended. A plurality of pawls 242 are mounted on the shaft 24l so as to extend upwardly thereform, and a stationary rod 243 extended between the arms 53 and 54 extends through openings-244 in the pawls 242 so asto limit rocking movement of the pawls 242 about the mounting shaft 24 I.

The pawls 242 are so disposed along the mount ing shaft I that the upper ends thereof are disposed in alignment with, or in the plane of the respective thickened teeth 250 of the accumulator wheels 50. The accumulator wheels in the present instance are formed so as to have 20 teeth thereon, and two wide or thickened teeth 25B are provided on each accumulator wheel at diametrically opposite points thereon. When an accumulator wheel 50 is in its zero position, one of the thickened teeth 25B is in engagement with a cam surface 25l on the head of the associated pawl 242, and as this accumulator wheel is advanced in an adding or counterclockwise direction, as viewed in Fig. 5, so as to represent a digital value of 9, the other one of the thickened teeth 250 is moved to a position wherein it engages an oppositely disposed cam surface 252 on the head of the associated pawl 242. Each pawl 242 is held in the position shown in Fig. 5 by a pivoted arm 255, a plurality of such arms 255 may be mounted on a supporting shaft 256 which is extended between the side plates and S: of the accumulator. The levers 255 are accurately spaced upon the shaft 256 by suitable spacing collars, and the levers are individuall biased into engagement with the adjacent edges of the related pawls 242 near the ends thereof by individual biasing springs 258 acting between the laterally extending arms 259 on the respective levers and a common anchoring shaft 260 which is extended between plates to and B I.

The pawls 242are arranged to serve as individual actuating means for the levers 255, and these levers are utilized as latching means to control operation of carry segments 215 which are adapted to be rendered operative upon those accumulator wheels which are allocated to the orders higher than the units order of the accumulator. The carry segments 215 are suitably mounted in spaced relation upon a supporting shaft 216 extended between the plates 60 and SI, and each carry segment has an upwardly projecting arm 21'! having a plurality of gear teeth 278 formed thereon in a position to be engaged by the related one of the accumulator wheels 50 when the accumulator is moved to its lower position of Fig. 5; and in addition, each carry segment has arms 280 and 28! projecting in opposite directions for cooperation with governing means which control the operative or active movements of the carry segments 215.

Since the carry segments 2T5 may, in the operation of the machine, be actuated and displaced in either rotative direction from their normal positions of Figs. 5 and 7, means are provided for imparting restoring movements to the carry segments 215 in both directions, and the arrangement is such that regardless of which way the carry segments have been displaced, the requisite restoring movement will be applied thereto. To this end a pair of generally similar restoring bails 285 and 286 are mounted on parallel axes 281 and 288 extended between the plates 69 and Si, and the arrangement is such that the cross bar 289 of the bail 285 is disposed beneath the arms 28!) of the carry segments 2'15 while the bar 290 of the bail 286 is disposed beneath the arms 28! of the carry segments. The side arms of the two bell cranks 285 and 286 are fixed to the shafts 231 and 288, and at at least one end of each shaft, the side arms of the bails are extended downwardly 9 as shown at 285 and 286' in Fig. 7 so that a link 292 connected between the lower ends of the arms 285 and 286' may serve to cause rocking movement of the bails 285 and 286 in unison.

The restoring bails 285 and 285 are operated during an adding cycle of the mechanism by a cam 293 fixed on the cam shaft 68, while during a subtracting cycle the bails are operated by a generally similar cam 293, as will hereinafter be described. Such restoring operation is accomplished by a bell crank lever, one arm 294 of which is pinned at 295 to the downwardly extending arm 285, and the other arm 296 of which is extended to provide a cam follower 29'! arranged during an adding cycle to bear against the periphery of the cam 293. A spring 298 acts between the arm 286 and the side plate 6! to maintain the cam follower 29! in engagement with the periphery of the cam. The normal rest position of the cam 293 is shown in Fi of the drawings and during the first half of a cycle of operation of the accumulator the follower 29'! is maintained out of engagement with a relieved surface 390 of the cam 293, this being accomplished by a stop 39! against which one arm of the bail 285 is urged by the spring 298. After the accumulator wheels 59 have been elevated out of engagement with the teeth 218 of the carry segments and into engagement with the racks 75, a leading surface 304 on the cam 293 engages the follower 291, thereby to rock the two bails 285 and 286 in a counterclockwise direction to the positions shown in Fig. 7 of the drawings. Thus if a carry segment 275 has been displacedin a clockwise or additive direction, the cross bar 290 of the bail 286 will be effective upon the arm 28! to restore the carry segment to its normal position. If on the other hand, the carry segment has been displaced in a subtractive or counterclockwise direction, the restoring movement of the two bails is exactly the same as in an adding operation but takes place at a different time in the cycle by reason of the use of the cam 293', and in such a subtracting cycle the restoring movement is imparted to the carry segment by engagement of the cross bar 289 of the bail 285 with the arm 289. When a carry segment 215 has been thus restored, it is latched in this normal position by a notch 395 formed in a downward extension of the associated lever 255 and arranged to engage a latching tooth 396 formed on the arm 28!! of the carry segment. It will be recalled that the levers 255 are urged in. a clockwise direction by their springs 258, and hence such latching engagement is maintained until the associated lever 255 is rocked in a counterclockwise direction due to engagementof a wide tooth 259 with one or the other of thecam surfaces 25! or 252 of the associated pawl 242.

After the carry segments have thus been latched in their restored position in an adding cycle, the high point or dwell surface 308 of the cam 293 moves out of alignment with the cam follower 291, and the cam follower 29'! drops onto or against a slightly inset dwell surface 3!!! on the cam 293, and as a result the two bails 285 and 286 are actuated slightly in a clockwise direction. This withdraws the two cross bars 289 and 290 slightly downwardly from the arms 289 and 28! respectively, and as a result when an associated latch 395395 is released, the related carry segment 2T5 may move or rock slightly in the direction in which it is then urged so as to move the elements of the latch out af alignment. This establishes what may be termed a conditioned relationship of the carry segment wherein the carry segment is slightly displaced from its normal relation, but isnever the less in such a position that, when the related accumulator wheel 5!! is lowered, the teeth thereof will be properly meshed with the teeth 218 of the carry segment. After an accumulator wheel has been thus meshed with a conditioned carry segment, the continuedrotation. of the cam 293 allows the cam follower 29'! to drop off of a radial shoulder 31,! toward the dwell surface. 391i and hence the bails 285' and 286 assume the positions shown in Fig. 5. wherein the cross bars 28 9 and 290 are spaced from their respective arms 280 and 28! in an amount which will accurately limit the carryover movement of the carry segment so as to intro: duce but one unit in the desired direction in the associated, accumulator wheel.

It has been pointed out hereinbeforethatthe carry segments 215 serve to introduce carry-overs into the. accumulator in either an additive or a subtractive sense, and. it will be apparent that the controlpawls 242, and the associated latch- 1 devices 305-305 may serve to condition the carry se ments for either additive or subtractive entry of carry-overs. In such conditioning of the carry segments aswell as in the carry-entering operations which follow, the carryv segments 11 .51 be urged in the appropriate direction in order that they may be introduced into the accumulator wheels in the same direction. or sense as the primary amounts were introduced in the operation in which the carry-overs arose. To this end spring means are provided in association with the carry segments and are arranged for the selective application of spring tension in. two opposite directions whereby the carry segments may be rocked in either a clockwise or a counterclockwise direction, in acoordancewith the diIBC-r tion. or sense in, which the sensed numerical amount is being entered into the accumulator.

In providing for such selectively applied spr ng tension, a shaft CH5 isjournaled in the side plates 60 and 6t, and a comb spring 3 i6 is secured thereon intermediate the side plates. The free ends of the teeth of the comb spring 316 are respectively engaged with bifurcations 3i"! provided at the free, ends of the respective arms 280 of thecarry segments, and thus by selectively rocking the shaft 315 in opposite directions, the direction in which spring tension is applied to the carry segments 215 may be reversed. Also it will be evident that by controlling th degree or amount of the rocking motion applied to the. shaft M5, the tension of the spring 356 may be varied. Such variation in the degree of spring tension is utilized in the present machine in pro.- viding for a strong tensioning action upon the. carry segments 215 when the segments are to be called upon to impart carry-over movement tov the accumulator wheels 59, and to provide for a relatively slight tension at other times in order to facilitate the required movements of the parts such as the restoring movements which are applied to the carry segments.

The tensioning of the spring 3 iii and the direction in which such tension is applied are controlled in accordance with the present invention through means which operate automatically in accordance with the type of cycle through which the machine is being operated. To this end the rock shaft 3E5 has an actuating plate 320 fixed on one end thereof as shown in Figs. 1 and 2, and means are provided in association with the actuating plate 320 whereby the rock shaft 3l5 may be rocked in opposite directions selectively in accordance with the direction in which the spring tension is to be applied, and whereby the degree of such rocking movement in either direction may be varied during the cycle of operation of the machine. Thus a rocker 32! afforded by a pair of spaced bars 322 is pivoted at one of its ends on the outer face of the side plate 60 by a pivot pin 323, and extends along the outer face of the side plate 33 so that its other end is disposed above and in spaced relation to the actuating plate 320. A transmitting link 324 is pivoted at 325 between the bars 322 at the other ends thereof so that the transmitting link 324 extends in a downward direction, and a roller 325 mounted in the lower end of the transmitting link 324 is arranged to be seated selectively in arcuate seats 326a or 326s which are provided adjacent to the opposite upper corners of the actuating plate 320. When the roller 325 is seated in the seat 325a and the rocker 32! is rocked downwardly about its pivot 323, the link 324 acts through the actuating plate 323 to rock the shaft 3 I5 in a counterclockwise direction as viewed in Figs. 5 and '7, and when such rocking movement is imparted to the shaft 3!5 the comb spring 3!6 may be bent to the form shown in Fig. 5 wherein tension is applied to the carry segments 215 in such a direction that carry-overs may be introduced into the accumulator wheels 50 in an additive direction. The actuating plate 32!} is cut away between the two seats 326a and 326s as indicated at 32'! so that the transmitting link 324 may be shifted to en gage th roller 325 thereon with the seat 325s, and when this has been done, a downward rocking movement of the rocker 32! will operate to rock the shaft 3l5 in a clockwise direction, thereby to apply tension to the comb spring 3H5 in a direction such that carry-overs may be introduced into the accumulator wheels 50 in a subtractive direction.

It has been pointed out hereinbefore that in the course of a cycle of operation of the machine the tensioning of the spring 3H3 is varied, and this is accomplished through the cooperation of cam means mounted on the accumulator cam shaft 68 in position to be engaged with a cam roller 329 mounted between the bars 322 of the rocker 32! intermediate the ends of the rocker. It will be observed that a spring 330 acting between the rocker 32! and the side plate 80 urges the rocker 32! in a downward direction, and in the normal at rest condition of the mechanism such spring tension maintains the cam roller 329 in engagement with a cam 33! which is fixed on the extended end of the shaft 58. The cam 33! is adapted to control movements of the rocker 32! during the adding cycles of the present mechanisms, and when the machine is at rest the cam 32! is positioned as shown in Fig. 1. Hence when the machine starts through an adding cycle, the comb spring 3!6 is under a relatively heavy tension and this condition prevails until about the time when the accumulator wheels 56 are elevated into engagement with the racks 15, and at this time an elevated dwell surface 332 on the cam 33! engages the roller 329 so as to raise the left hand end of the rocker 32!. Thus the shaft 3!5 is allowed to rock slightly in clockwise direction from the position shown in Fig. 5 to thereby reduce the spring tension applied to the carry segments 215. While the spring tension is thus reduced the carry segments 215 are restored as hereinbefore described. In an adding cycle, after the carry seg- =ments are thus restored and the desired values have been entered into the accumulator wheels by the return movement of the set up sensing bars, the accumulator wheels are lowered through the action of the cam 5 and thereupon the roller 329 rides off of the elevated dwell surface 332 of the cam 33! to thereby apply increased tension to the comb spring 3H5 and effect carryover entries from those carry segments which have been conditioned or unlatched during the entry of the numerical amount by the sensing bars in the preceding portion of the machine cycle.

The cam 33! is normall maintained in its operative relation to the cam roller 329, but when a subtracting operation is to be performed, a11- other cam 34!, Fig. 4, which is also fixed on the shaft 68 is brought into cooperating relation with the roller 329 and the cam 33! is moved. out of cooperating relation. with the roller. This is accomplished through axial shifting movement of the shaft 68 together with the various cams mounted thereon, it being observed that the shaft 68 as herein shown is urged toward the left hand side of the machine, that is in an upward direction as viewed in Fig. 4, by spring means acting upon one end of the shaft 68. Thus as shown in 1 of the drawings, a leaf spring 342 is mounted on the side plate so that the spring acts upon the right hand end of the accumulator cam shaft 63, and the spring 342 acts normally to urge the cam shaft 53 in a left hand direction to 2 normal position wherein the cam 67 is aligned with the cam roller 66 and the cam 33! is aligned with the same roller 329.

When the cam shaft 68 is shifted in a right hand direction so as to move the cams 233 and 34! into operative alignment with their respective cam rollers, the machine may be operated through a subtracting cycle. In such a cycle the cam 23!! operates immediately to elevate the accumulator wheels 5!] into meshed relation to the racks l5, and in this cycle of operation numerical amounts are introduced into the accumulator in a subtractive direction during the rearward movement of the sensing bars, and at the time when the accumulator wheels 50 are elevated, the cam 34!, which is then in its operative relation to the cam roller 323, acts as soon as the rotation of the accumulator cam shaft 58 is started to raise the rocker 323. This has the effect of reducing tension upon the comb spring 3! 6, and also serves to cause shifting movement of the transmitting link 324 to engage the roller 325 thereon with the seat 3253. Such shifting of the transmitting link 324 is effected through the medium of a slide 353 which is mounted for longitudinal sliding move- 'ment in brackets 35! and 352 carried on the outer face of the side plate 50. On its low edge the slide 353 has a downwardly extending abutment lug 355 which may be positioned selectively in the path of rollers 355s or 356a which are mounted on arms extended in opposite directions from the upper end of the transmitting link 324. Thus when the transmitting link is to be shifted from the position shown in Fig. 1 to the position shown in Fig. 2 in the course of a subtracting cycle of operation, the slide 350 is shifted from its normal position of Fig. 1 in a forward direction to the position shown in Fig. 2, thereby to locate the abutment lug 355 over the roller 3555. In such shifting movement the slide bar 35!) may yield upwardly against the downward force of a spring 358, but this spring holds the abutment lug 355 firmly against the roller 356 when the forward shifting movement of the slide bar has been completed. Thus when the cam 34! elevates the rocker 32! at the beginning of the subtracting cycle, the roller 3568 is pressed against the abutment lug 355 so as to cause counterclockwise rocking movement of the transmitting link 3% which moves the roller 325 thereof into the seat 3268 of the actuating plate 320. In the course of this readjustment of the parts, the spring 3I6 tends to straighten out and return the actuating plate toward a horizonal relationship so that the shifting movement of the transmitting link 324 may be readily accomplished.

When the accumulator cam shaft'68 is shifted axially in a right hand direction at the beginning of a subtracting operation, the restoring cam 293 is moved out of alignment with respect to the cam follower 291 of the restoring mechanism of the carry segments, and the similar restoring cam 293' is moved into alignment with the cam follower 23?. The cam 293 has the same form as the cam 293 but is disposed in a different rotative relation upon the accumulator cam shaft 68, this relation being such that the leading surface 304 of the cam 293 engages the cam follower 2d! at the time the accumulator wheels 56 are being elevated to engage the rack 75. This leading surface 364 therefore causes the carry segments 215 to be restored at substantially the time when the accumulator wheels become engaged with the racks 275. Thus during the first half of a subtracted cycle the carry segments may be conditioned for operation whenever a wide tooth 256 acts upon the cam surface 252 of a control pawl 242, and in the last half of the cycle, after the accumulator wheels 50 have been returned to their engaged relation with respect to the carry egments, the cross bars 283 and 296 may be lowered and the spring 3i6 ma be additionally ten sioned to effect entry of carry-overs from the condition carry segments. Such additional tensioning of the comb spring 3I6 takes place when the roller 329 rides oil of the elevator surface 342 at the point 342 as indicated in Fig. 2 of the drawing.

In a subtracting cycle as just described the operation of the printing means takes place in substantially the same manner as hereinbefore described with respect to the adding cycle, in that the rocker 96 engages the pin 2I8 at the end of the clockwise rocking movement of the rocker 96, thereby to release the latching bail 256 and cause operation of the hammers I96. It will be understood, of course, that in some instances a suitable symbol might also be printed to indicate that a numerical item has been entered subtractively into the accumulator, but such means is not required in the present mechanism since this mechanism is intended and adapted for use with printed forms, and the subtractive amounts are indicated as such by the position in which they are printed on the form.

At the end of a subtracting cycle, the slide bar 350 is returned in rearward direction to the position shown in Fig. 1, this being accomplished by means which will be hereafter described in detail. Thus at the end of a subtracting cycle the machine is conditioned for the performance of an adding operation in the next cycle of operation.

In the course of operation of the machine the various amounts are accumulated on the accumulator gear wheels 50 and usually at the end of a predetermined series of operations, which may in some instance be referred to as the end of a run, it is desired to read out the total of the amounts that have been accumulated on the wheels 50 so that such a total may be. printed by the related printing mechanism, and to this end one of the keys K is arranged to institute a total-taking cycle of the machine wherein the accumulator gear wheels 56 are caused to be en gaged with the racks I5 in such a way that the setting of the wheels 56 can be utilized to set up associated printing means so that the total accumulated on the wheels may be printed therefrom. In this connection it will be evident that in a total-taking cycle instead of the accumulator gear wheels 50 being engaged with the racks 15 during the forward movement of the set-up bars Ml, this must be done during the rearward movement of the set-up bars 46. This end is accomplished through the use of the subtracting cam 236 which is shifted into cooperating relation with the cam roller 66 when a total taking operation is to be performed.

A total taking operation is initiated by pressing down on a key lever 360, Figs. 4, 7 and 6, this key lever being loosely mounted on the shaft I21 which extends between the side plates I28 and I29. The key lever 366 has a laterally projecting lug 36I formed thereon so as to overlie a relatively large control rocker 364 which is also pivoted loosely upon the cross shaft I2l. Thus when the key lever 366 is depressed, the lug 36I imparts a similar movement to the con-- trol rocker 36d. The control rocker 364 has a downwardly projecting arm 365 thereon, Figs. '7 and 6, which in the downward rocking movement of the rocker 364 is engaged with the forward edge of a laterally projecting arm 366' formed on the downwardly projecting arm of a bell crank 365. The arm 365 has an upstanding cam roller 36"! thereon which in the described rocking movement of the lever 366, engages a sloping cam surface 366 formed on the forward end of a control lever 310. The control lever 3'I0 is pivoted on a vertical shaft 3', Fig. 4, and has a rearwardly projecting lever 372, which is also pivoted on the shaft 3H, secured thereto by an adjustable screw device 313 so that. the lever 312 moves with the lever 210.

The lever 312- is so disposed that the side edge thereof engages the left hand end of the accumulator cam shaft 58, and when the roller 365 causes rocking movement of the lever 312 in a clockwise direction as viewed in Fig. 4, the accumulator cam shaft 68 is shifted axially against the action of its spring 342 to such a position that the cams 294', 230, and 34! are aligned respectively with the cam follower 291, the cam roller 66, and the cam roller 329. When this relation has been obtained the lever 312 is latched by latch member 315 which is pivotally supported at 316 on the side plate 6I. This latching action is accomplished by a notch 31! in the latch member 315 which engages a lug 318 which projects downwardly from the lever 372 near the rear end thereof.

As an incident to the depression of the total key lever 330, the clutch control solenoid H6 is energized thereby to start rotation of the cam shafts 'II and 68. This is accomplished by closure of a normally open switch 386 in the energizing circuit of the solenoid III) and which is mounted on a bracket 38! carried on amounting bar 383 extended from the side plate- I28 to the plate I 29 and somewhat beyond the plate I29 as shown in Fig. 4. A switch operating lever 39!] is centrally pivoted at 39I on the forward edge of the bar 388 so that one end thereof underlies the free ends of the switch 385 while the other end thereof underlies the lever 366. Thus when the arm 365 of the total key lever 360 engages the laterally projecting arm 366 of the lever 366, the forwardly projecting arm of the lever 366 presses one end of the switch operating lever 390 downwardly so that the other end thereof moves upwardly and closes the switch 386.

It will be recalled that when the cam 230 is operative upon the cam roller 66, the accumulator wheels 50 are moved into engagement with the rack 15 at the beginning of the cycle, and as the set-up bars move rearwardly, the accumulator wheels are operated in a clockwise direction, or in other words in a direction opposite to the normal adding direction. In a total taking operation it is desired to terminate such clockwise movement of each of the accumulator wheels when the respective wheels reach what may be termed their zero positions, and a plurality of normal inoperative zero stop pawls 395 are provided to accomplish this purpose. In practice the zero stop pawls 395 are unitary in construction in that all of the zero stops are formed on a single member by milling of slots into the upper edge of the member. The zero stop pawls 395 are fixed upon a shaft 396 which is extended between and rotatably mounted in downwardly extended lugs 391 provided On the ends of the arms 53 and 54. An opening 391 is provided through the member which provides the stops 395 and a rod 398 extends therethrough and is mounted in the lugs 396 to limit rocking movement of the zero stop pawls. On one end of the shaft 396 a bell crank is fixed so that one arm 399 thereof extends downwiardly, and a spring 400 acts on the arm 399 to maintain the zero stops 395 in normally retracted positions as shown in Fig. 5. The other arm 401 of the bell crank extends in a forward direction and is utilized in shifting the zero stops 395 to their active positions during a total taking operation Such actuation of the zero stops 395 is initiated when the control rocker 364 is operated, there being a rod 403 extended rearwardly, Fig. 3, from the rocker 364 to a lever 405. In the present instance the lever 405 is mounted upon a rocking bar 185 so that the rocking bar 185 provides the pivotal axis for the lever 405. At its lower end, as shown particularly in Fig. 4, the lever 405 has a cam block 406 mounted thereon. The cam block 406 is so arranged that in the upward rocking movement of the lever 405, a cam surface on the cam block acts upon the head of a pin 409 which is mounted so as to extend through the side plate 61 of the accumulator. Th pin 408 is normally biased to the inactive or withdrawn position shown in 4 by a spring 409, but when the lower end of the lever 405 is rocked upwardly, the cam block forces the pin 408 inwardly beyond the inner face of the side plate 61 so that the pin 408 is located in a projecting position above the arm 401. Thus when the accumulator wheels 59 are elevated at the beginning of a total taking cycle, the arm 401 strikes the projected pin 408 so as to rock the zero stop pawls 395 to their active positions of Fig. '1. The zero stop pawls are maintained in this position at least until the first half cycle of the machine is completed, this being accomplished by latching the lever 403 in its elevated position. For this purpose a pin 410 is provided on the lever 493 in such a position that when the lever 403 is elevated, a block 411 on the lever 312 is moved into position beneath the pin 410 as the lever 312 is moved to its latched position. Since the lever 312 is maintained in its latched position until substantially the end of the machine cycle, the lever 403 is correspondingly latched and the zero stops are maintained active. During this time the clockwise movement of the rocker 96, Fig. 1, permits the various set-up bars 40 to be yieldingly moved in a rearward direction, and this rearward movement of each of the set-up bars continues until one of the side teeth 250 of its associated accumulator wheel 50 strikes the upper end of the associated zero stop pawl 395. Thus when the rocker 96 has reached the end of its clockwise stroke, all of the accumulator wheels will be in their zero positions. The cam 230 then acts to lower the accumulator wheels 50 so that they are disengaged from the racks 15 and are engaged with the teeth 219 of the carry segments 215, it being observed that at this time all of the carry segments are in their fully latched or normal positions, since no carries have arisen in the course of the return of the accumulator wheels to their zero positions.

In this last half of a total-taking cycle the rocker 96 restores the set-up bars 40 in a forward direction to their normal position, and at substantially the end of the cycle, the latch 315 is released so that the mechanism may return to its normal relation and be thereby conditioned for the next cycle of operation. Such release of the latch 315 is attained by cam means including a generally circular cam disk 4 I 5 mounted on the main cam shaft 11, this cam disk being engaged by a roller 416 mounted on one arm 411 of a bell crank which is pivoted at 418 as shown in Fig. 3. A spring 419 acting between the other arm 420 land a stationary part of the frame maintains the roller 416 against the cam 415, and the arm 420 extends upwardly to a position wherein it may engage a pin 421 which is extended down from the lower face of the latch 315. When the mechanism reaches substantially the end of a cycle, the roller 416 rides into a recess 423 in the cam 415, and when this occurs the arm 420 engages the pin 421 to release the latch 315. This frees the lever 312 so that the spring 342 acts to return the accumulator cam shaft 68 to its normal position shown in Fig. 4 of the drawings. Such unlatching of the lever 312 also unlatches the lever 403 so that the plate 182 returns to its active position and the pin 409 is withdrawn to its normal inactive position.

In certain instances it may be desirable to ascertain the subtotal of the numerical items entered into the accumulator wheels 50, and when this is desired a subtotal key lever 430 which is mounted on the extended end of the cross shaft 121 is depressed. The subtotal key lever 430 as shown in Figs. 3 and 14 is in the form of a bell crank so as to provide an upwardly extending arm 431, and this arm has a link 432 extended rearwardly therefrom. The rear end of the crank is connected by a pin and slot joint 433 to an accumulator control lever 434. The accumulator control lever 434 is pivoted at its upper end on a pivot pin 435, and at its lower end the accumulator control lever has a laterally extended arm 436 having a cam surface 431 thereon adapted to engage a roller 438 which is extended from an accumulator shaft 51 outwardly through a slot 439 in the side plate 61. The accumulator control lever 434 is normally urged toward its inactive position of Fig. 3 by a spring 449, but when the subtotal key lever 430 is depressed, the lever 434 is drawn forwardly against the action of its spring 440 so that the cam surface 431 engages the roller 438 and lifts the accumulator wheels 50 into engagement with the racks of the sensing bars. The accumulator control lever 434 is latched in this position by a latch 4M which is urged to its active position by a spring 442. Thus the accumulator wheels 59 are held in their elevated positions until the latch 44! is released.

In a subtotal operation the accumulator wheels 50 are returned to their zero positions as determined by the zero stop pawls 395, and hence these pawls are rendered active when the subtotal lever 430 is depressed. To attain this action the control rocker 364 has a lug 445, Figs. 4 and 6, extended from its lower edge so as to underlie the subtotal key lever 430, and hence when the subtotal key lever 430 is depressed, the control rocker 364 is operated and accomplishes the functions hereinbefore described with relation to the total taking operation. These functions include the operation of the pin 3% upon the arms I and I26 to lower the block l2! to the inactive position of Fig. '1. The control rocker 364 also acts upon the lever 366 which operates the switch actuating lever 390 to thereby trip the clutch I05, and the roller 361 operates the levers 319-312 to their latched positions wherein the accumulator cam shaft is shifted so as to locate the cams 293', 230' and 34! in the positions which they occupy in a total taking operation.

When the respective accumulator wheels 553 have been returned to zero, the accumulator wheels are maintained in engagement with the racks 15 during the return or forward movement of the set-up bars 49. This is accomplished by the accumulator control lever 434 which is maintained in its active position by the latch 44! even though the subtotal key lever 430 is released. When the restoring movement of the set-up bars 40 have been completed the accumulator control lever 434 is released under the control of the cam M5 by utilizing the motion which is imparted to the latch 315 to impart releasing movement to the latch 44!. Thus as shown in Figs. 3 and 4, the latch 315 has an upstanding ear 450 thereon in such a position that when the latch tit is released the car 450 engages the end of an adjustable screw 45| carried on a downwardly projecting arm 452 of the latch 44!. Hence the accumulator control arm 434 is unlatched at the end of the cycle and is withdrawn by its spring 440, and the accumulators which have been returned to their previously set positions are moved downwardly out of engagement with respect to the racks 15. Thus the machine is in condition for the next accumulating or other operation thereof.

When a subtracting operation is to be per-- formed, a subtraction key lever 46!! is depressed, the lever 460, Figs. 4 and 6, being loosely mounted on the cross shaft [21. An car 46! is formed on the subtraction key lever 46!] so as to extend over the lever 366 in position to control switch 386. Moreover, in the actuation of the subtracting key lever 460, the roller 36'! acts upon the lever 310 to shift the lever 312 to its latched position. This shifts the accumulator cam shaft 68 so that the cams 293', 230 and 34! assume their active positions, with the result that the cam 293' operates the restoring mechanism of the carry segments, the cam 230 shifts the accumulator wheels 50 and the cam 34l operates the carry-control rocker 32l in the proper timed relation to accomplish the entry of carry-overs 18 in the subtraction operation. The shifting of the lever 312 to its latched position also serves to shift the slide bar 355} to the forward position shown in Fig. 2 of the drawings, and this is accomplished by a laterally extending lever arm 465, Fig. 4, which is operatively connected to the lever 3T2 in an adjustable manner by a screw ole-- vice 466. The lever arm 4% has a rounded head 46'! at the end thereof and this head is located in a slot 458 formed in the upper edge of the slide bar 3559. Hence the slide bar is shifted forwardly at the beginning of a subtracting operation, and is returned to its rearward position when the latch 315 is released at the end of the cycle of operation. Hence when the latch lilii has been released, the parts of the machine are in their normal positions and the machine is conditioned for the next cycle of operation.

The adding cycle of operation of the machine, which has hereinbefore been described in detail, is in the present instance initiated merely through. energization of the clutch control solenoid llil for it will be observed that in its present form the elements of the machine at the end of each cycle assume relationships adapted for the performance of an adding cycle. Hence when an adding cycle is to be performed, an adding key lever t lt is actuated which is loosely mounted on the cross shaft Hil in such a position that depression thereof will engage the switch 286 to close the same, and when this is done the machine operates through the adding cycle which has been hereinbefore described in detail. In the use of the accumulator of this invention,

r where it is embodied in a machine having card controlled or like set-up mechanism the operation will provide for the accumulation of a rela-- tively large positive total and for the subsequent subtraction of one or more smaller numerical amounts to produce a positive total. By reason of this manner of use of the machine it is unnecessary to afford a fugitive 1 mechanism. When the set-up means have been set, the operator may initiate a cycle of the machine, this being done through depression of the key lever tilt. In such cycle the main clutch Hi5 of th machine is engaged so as to drive the main shaft 1 l and the cam shaft 92 through a one-revolution cycle of operation.

The set-up members 43 are in such a cycle moved through their set-up movement, and as indicated in Fig. 18 this is initiated soon after the cycle is started, the rocker 9t and the roller at being moved rearwardly to allow set-up members to be yieldingly urged in a rearward or sensing direction. Such yielding actuation of the set-up members 4G is accomplished by the springs Hi5 and I I6 which in the present instance act upon the gear segments H3. The yieldingly induced set-up movement of the set-up members 4E3 may continue until the respective members 46 encounter set-up means with which they are associated, and in the adding operation which is now in progress, such set-up movement takes place while the accumulator pinions 5d are in theirlower positions of Fig. 5, thereby rendering such set-up movement independent of the accumulator wheels 59. As illustrated in Fig. 9 of the drawings, the set-up member 40 has moved rearwardly and into cooperation with a position representative of the digit During such rearward-movement of the set-up bars 48, the roller 66 on the accumulator frame 53 is engaged with a dwell portion of the cam 6'! so that the accumulator wheels 50 are maintained in their lower positon. Early in the second half of the machine cycle, that is, after the completion of the rearward movement of the set-up bars 46, the roller 66 is engaged by a leading portion on the cam 6i which results in elevation of the frame 53 and the accumulator wheels 59 into an elevated position. such as that shown in Fig. 9 wherein the teeth of the pinions 50 are engaged with the rack. teeth 15 so that entries may be made into the accumulator wheels during the forward or return movement of the set-up bars 40. Since it may be assumed that the accumulator was cleared in the preceding machine cycle, the wide teeth 2% which constitute the index elements on the left hand edge of the pinions 59 as shown in Fig. 9 are at this time engaged with the lower cam surfaces 256 of the transfer or carry pawls 242 of the carry over mechanism, as shown in Fig. 9, and during the forward or restoring strokes of the set-up bars, the accumulator wheels 50 are rotated in a counterclockwise direction to thereby introduce the set-up numerical amounts into the accumulater in an additive direction. Thus, a comparison of Figs. 9 and. will show that during the return stroke of the set-up bar 49 there shown, the index element 250 of the associated accumulator wheel 59 has been moved nine spaces in a counterclockwise or adding direction, thereby indicating the additive entry of 9 into the associated accumulator wheel 50.

It should also be observed that while the set-up bars dwell in their rearward or amount indicating positions, an associated printing mechanism may be operated to print the represented numenical amount.

In the restoring movement of a set-up bar M), such as that indicated in Figs. 9 and 10, the rotation of the associated accumulator wheel Ell in a counterclockwise direction from its zero position of Fig. 9 to its 9 position of Fig. 10, moves the other one of the index elements 259 into engagement with the upwardly facing cam surface 252 of the transfer pawl M2. It will thus be seen that when another operation of the accumulator wheel 56 takes place in an additive direction the first movement of the accumulator wheel will actuate the pawl 242, as will be hereinafter described. During the entry of 9 as above described with reference to Figs. 9 and 10, there is no operation of the associated carry over mechanism so that the accumulator wheel 59 remains in the 9 position of Fig. 19 until the end of this cycle. After the return movement of the set-up bars 49 has been completed, at the time indicated in Fig. 18, the elevated dwell portion of the cam 6'1 rides out of alignment with the roller 66 of the accumulator frame and hence the accumulator frame 53 is lowered and the accumulator wheel 50 is moved from the position shown in Fig. 10 to the position shown in Fig. 11, and in this later position the accumulator wheel is engaged with the teeth 218 of the related carry over member 275.

In order to fUI'lGI illustrate the operation of the accumulator mechanism and the carry over mechanism thereof, it will be assumed that in the next machine operation the set-up mechanism will be set to add l in the order which corresponds to the order to which the set-up member 40 of Fig. 10 is allocated. The operator will therefore initiate the next cycle of operation by depression of the key lever 489. The associated set-up bar 50 will then be moved yieldingly in a rearward or set-up direction from its normal or restored position to the position shown in Fig. 11 of the drawings, and such movement will be tarminated by the associated set-up or control means.

At the completion of this set-up movement the set-up bar Ml will be located in a position which also representative of 4. The cam 6'! then acts upon the accumulator frame 53 to engage the cumulator wheels 5!. with the racks 75, M about this time the carry over spring 3 i 6 will have its tension reduced so that the carr mechanism will be in condition for actuation of the carry pawls 242. Such reduction of the tension upon the carry over sprin 316 is caused by the ongagement of the elevated dwell portion 332 of the cam 33I with the roller 329 of the tension varying mechanism. The elevated dwell of the cam 33! causes the frame 32! to be rocked upwardly, thereby raising the link 324, Fig. 1, and allowing the spring carrier shaft 3l5 to rock slightly in a clockwise direction, to thereby reduce the tension on the spring 3l6.

At about this time, as indicated in Fig. 18, in the event that any of the carry-over members 2'15 have been actuated from their normal positions, the requisite restoring movement is applied thereto. At this time the carry spring 3S6 is relatively lightly tensioned, as hereinbefore described, so that the IOCkillg movement of the two restoring bails 23-5 and 285 may be readily accomplished. In such restoring movement the two restoring bails 285 and 2% move in unison so that the cross members thereof approach the carry members 275 on opposite sides of the rocking axis of the carry members, and hence one of the bails will inevitably engage the opposed one of the transverse arms of any carry over member which has been actuated from its normal position. This will return the carry over member to the normal position shown in Fig. 9 so that the latch member 255 may become engaged with the carry over member to hold the same in its normal position. Soon after such restoring movement of the carry segments has been completed, the cross members of the two bails 285 and 286 are retracted slightly from the projecting arms of the carry over members 215 so that such carry over members may, when unlatched, move slightly out of their normal positions for a distance sufficient to insure continued disengagement of any latch which has been thus released. This position of the restoring bails 285 and 286 is illustrated in Fig. 10 of the drawings.

After the carry segments 215 have been restored as aforesaid, the set-up bars 40 start upon their restoring or forward movement, this action taking place at the time indicated in 18. In the course of such restoring movement, the associated accumulator wheels 59 are operated in an adding direction in amounts corresponding to the set up positions of the set-up bars. Thus when a set-up bar has been set up to indicate the numeral 4, as shown in Fig. 11, accumulator wheel 50 which has been previously set to indicate "9 will be actuated in a counterclockwise or additive direction to the position indicated in Fig. 12. In the course of such counterclockwise movement the index element 250 which has been initially located in abutment with the cam surface 252 of the carry pawl 242 will act upon this cam surface to rock the associated carry pawl 242 to its released position of Fig. 12. Such an actuation of the pawl 242 acts upon the latch member 255 to release the latch, and the associated carry over member 215 is thereby released for rocking movement. Such rocking movement in an adding operation of the machine is in a clockwise direction since at this time in such an adding cycle the spring 3|! is lightly tensioned in the direction indicated in Fig. 12. The spring 311 will therefore rock the released carry over member 215 slightl in a clockwise direction until the arm 28! engages the cross member of the bail 286. This movement is relatively slight and is such that the teeth 218 of the released carry over member 215 remain in substantial alignment with the appropriate teeth of the associated accumulator wheel 50, and it should be noted that the carry over member 215 which has thus been released is the one which is adapted for engagement by the accumulator wheel 51 in the next higher order of the accumulator.

After the restoring movement of the set-up bars 40 has been completed, the cam 61 causes the accumulator wheels to be moved downwardly and out of engagement with the racks 15, and at the same time the accumulator pinions are engaged with the carry segments 215. At about this same time the elevated dwell portion 332 of the cam 33! rides out of alignment with the roller 329 so that the tension varying frame 32! is rocked downwardly by its relatively strong spring 330. This imparts a relatively heavy tension to the carry over spring MB and such tension is in this cycle of the machine applied in the direction indicated in Fig. 12 and 13 so as to urge the carry over members 215 in a clockwise or adding direction. After the engagement of the accumulator wheels with the carry over segments 215, the restoring bails 285 and 286 are rocked an additional distance in a clockwise direction to the positions shown in Fig. 13, thereby to permit carry over movement of those carr over members 215 which have previously been unlatched. This movement is accurately limited by the cam 283 to an amount which is just suificient to cause entry of one digit into the accumulator wheels associated with the released carry over members. It may happen, of course, that the introduction of a carry over into one order of the accumulator in the manner just described will advance the accumulator wheel 50 of that order into its zero position, thereby to trip the pawl 242 and the latch 255 of the next higher order. Such a condition would arise, for example, in the event that the figure were entered additively into the accumulator when the amount standing therein in 90,999. In such an instance, the entry of the a in the units order would cause a, carry over to be entered in the tens order in the manner hereinabove described, with the result that the accumulator wheel 50 of the tens order would pass from 9 to and hence the pawl 242 of the hundreds order would be actuated so as to release the latch 255 of the thousands order of the accumulator. This would, of course, take place at a time when the restoring bails 285 and 286 were in their fully retracted positions of Figs. and 19, and hence the carry segment 215 of the thousands order would immediately move through its full range of movement in an adding direction, thereby to enter 1 in the thousands order. Thus, a carry on a, carry is effected; and in the cited example, this would move the accumulator wheel 56 of the thousands means to control the set-up element 40 shown in Fig. 1 1. The operator than initiates the next cycle of operation of the machine by depression of the key lever 460, and this lever is eifective not only to initiate the cycle but also to condition the mechanism so that the desired numerical amount will be entered into the accumulator in a subtractive direction. Thus the lug 46! on the key lever 460 engages and actuates the rocking lever 365 and in its rocking movement, the roller 366' engages the cam surface 369 on the lever 316 to rock the lever 310 in a clockwise direction about its pivot 31| as viewed in Fig. 4:. The lever 312 is connected to the lever 310 so that the lever 312 is moved to such a relation that it is engaged by the latch 315. In such movement the lever 312 engages the adjacent end of the accumulator cam shaft 36 so as to actuate this shaft against the force of the spring 342. Such movement of the cam shaft 68 changes the relationship of the various controlling cams so that the cams which are to function in a subtracting operation are moved. into their operative positions. Thus the cam 293', Fig. 4., is moved into alignment with the nose 291 of the lever 296, this lever being connected to the restoring mechanism of the carry segments. Similarly the cam 230 is moved into alignment with the cam roller 66 of the accumulator supporting frame 53, while the earn 342 is moved into alignment with the cam roller 329 of the spring tensioning frame 32!. The shifting movement of the lever 312 also serves to shift the slide bar 350 in a forward direction, as will be evident in Fig. 4 of the drawings, and such movement positions the abutment lug 355 of the slide bar 350 in a position over the roller 356s and because the arm 365 is rigidly secured to the lever 312, the latch 315 serves to .hold the slide bar 3511 in its forward position until substantially the end of the machine cycle.

The foregoing conditioning movements which are imparted to the various elements of the mechanism occur as an incident to the depression of the key lever 460 which also operates through the cross lever 390 to close the control switch 336. Such closure of the switch 386 causes the clutch I05 to be engaged so as to drive the various shafts of the machine through their onerevolution cycles of operation. Soon after the cycle of operation is thus instituted, the cam 230 acts upon the roller 66 to elevate the accumulator frame 53, thus to engage the accumulator wheels 51! with the racks 15 as shown in Fig. 14: of the drawings, and the time in the cycle at which this occurs is indicated on the timing chart which constitutes Fig. 17 of the drawings. At about this same time, as indicated in Fig. 17, the cam 34! acts upon the roller 32!) to elevate the spring tensioning frame 32 I, thereby to reduce the tension of the carry-over spring 315, and since the lug 355 of the slide bar 350 is disposed over the roller 3538, the raising of the tension varying! frame 321 causes the link 324 to be rocked in a counterclockwise direction from the position of Fig. 1 to the position of Fig. 2. This causes the roller 325 to be seated in the recess 3258, thereby to apply tension to the spring 3l6 in subtractive direction. After the tension of the spring 3l6 has been reduced and reversed in this manner, 

